Blender not allowing different effector collections for two different particles systems
You're using the same particle settings in the two particle systems on your emitters. You have a different name in the particle system slot, but it's not a different setting.
Think of the particle system slot to be more like a material slot. You can put more materials on one object, but as long as the material in one slot is the same as one on a different object, changing one material will change the other, too.
In the materials this is indicated by a small number next to the material's name. The same goes for the particle settings shown below the particle system slots. And like in materials, to get a new independent particle setting, just click on the small number right next to it.